CSEC Chemistry · January 2009 · Paper 2 · Question 1(a)(v)

Students are conducting an experiment to determine how hydrochloric acid concentration affects its reaction rate with magnesium. They have magnesium ribbon, 1.5 mol dm⁻³ HCl, deionized water, and lab equipment. They will perform four experiments using 50 cm³ of acid each time.

Figure 1 shows a series of diagrams that represents how the students set up the experiment to determine the effect of the concentration of acid on the rate of the reaction. Identify THREE major flaws in the design of the experiment conducted by the students. Write your answer on page 5.

This question uses a figure or table from the paper — you'll see it when you practise.